Causes of the divergence of magnetic tube photospheric bases in AR 10930

It is traditionally considered that the bases of emerging magnetic tubes, which are observed as magnetic elements (tube “sections”) moving away from one another at the photospheric level, diverge completely because tubes are loop-shaped below the photosphere. It is assumed that there may be more causes. The possible Ampere force contribution to the divergence of the photospheric bases of a coronal magnetic rope (the magnetic tube system) with a current has been considered based on the evolution of photospheric magnetic fields in active region 10930 during December 8–13, 2006.